What to Know Before You Go
Colorado is a state of dramatic beauty and ever-changing skies. Colorado experiences all four seasons and visitors quickly learn that weather in Colorado is anything but predictable—especially at higher elevations. Whether you’re planning a mountain hike, a scenic drive, or a weekend in Denver, here’s what you should know about the seasonal shifts, elevation impacts, and smart ways to stay comfortable year-round.
🍂 Fall: Crisp Air & Golden Aspens
Fall in Colorado is breathtaking—especially in the mountains, where aspen trees turn brilliant gold in late September to early October. But don’t let the sun and colors fool you—snowstorms can arrive early, especially above 8,000 feet.
Layer up: Mornings can start near freezing and afternoons might still hit 70°F. Bring a warm layer and a windproof jacket for alpine breezes.
❄️ Winter: Snow, Sunshine & Surprises
Colorado winters are famously snowy in the mountains but surprisingly sunny, especially in Denver and the Front Range. Ski resorts often open as early as late October and stay snowy into April. Storms can roll in quickly, dropping temperatures by 30+ degrees in a matter of hours.
Elevation matters: The same storm that drops a dusting of snow in Denver might dump 2 feet of snow in Breckenridge.
🌷 Spring: Snow Melt & Flowers
Spring in Colorado is a mix of snowmelt, sunny days, and late-season snowstorms. Elevation delays spring’s arrival—while Denver might bloom in March, the high country often remains frozen until May.
Dress in layers: A thermal base, midweight fleece, and waterproof outer shell go a long way during this transitional season.
🌞 Summer: Sun-Soaked Days & Afternoon Storms
Summer brings warm, dry days and cool nights—perfect for hiking and exploring. But at elevation, conditions can turn on a dime. Afternoon thunderstorms are common in the mountains, often forming with little warning.
Plan early hikes especially if going above the tree line, and always carry a rain shell.
And here’s what many travelers forget: sunscreen is essential. At higher altitudes, UV exposure is significantly stronger—even on cloudy days.
🎒 Colorado Clothing Tip: Layer Smart
The key to staying comfortable in Colorado? Wear layers you can peel off or add as the weather shifts. A good formula:
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Base layer (moisture-wicking)
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Mid-layer (fleece or light insulation)
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Outer layer (wind/water-resistant)
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Hat, gloves, sunglasses—and always sunscreen
☀️ Don’t Underestimate the Sun at Altitude
It’s easy to overlook sunscreen in cooler or overcast conditions, but UV radiation increases about 10–12% for every 3,000 feet of elevation. That means even on a brisk spring morning in the mountains, your skin is soaking up more UV than you’d expect.
Apply sunscreen before heading out—and reapply often if you’re active or at elevation.
🏔️ Final Thought
Colorado’s seasons are stunning, but also unpredictable. Whether you’re visiting Denver, exploring mountain towns, or heading to alpine trails, understanding the rhythm of the seasons—and how elevation magnifies weather changes—is key to enjoying your trip safely and comfortably.
Pack smart, dress in layers, and wear sunscreen year-round—your Colorado adventure will thank you.